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Typical globular clusters (GCs - young and old) host stellar populations withlittle or no star-to-star variations in heavy elements (e.g., Ca, Fe) nor inage. Nuclear star clusters (NSCs), on the other hand, host complex stellarpopulations that show multi-modal distributions in Fe and often in age,presumably due to their unique location at the centre of a large galacticpotential well. However, recently a new class of clusters have been discovered,exemplified by the clusters Terzan~5 and Liller~1, two high mass, highmetallicity clusters in the inner Galactic regions. It has been suggested thatthese are not true GCs, but rather represent left over fragments of theformation of the Galactic Bulge. Here, we critically assess this scenario andfind that the role of dynamical friction likely makes it untenable and that themethod used to estimate the initial masses of the clumps was invalid. Instead,it appears more likely that these clusters represent a relatively rarephenomenon of existing GCs accreting gas and forming a 2nd generation, as hasbeen previously suggested.

Star Cluster Ecology: Revisiting the Origin of Iron and Age Complex Clusters